福建紫金山矿田金、银赋存状态及黄铁矿标型研究

摘要

福建紫金山铜金矿床、悦洋银多金属矿床和罗卜岭斑岩型矿床同属于与陆相火山岩相关的斑岩－浅成低温热液成矿系统。通过显微镜观察、电子探针成分分析、场发射扫描电子显微镜观测和矿石元素含量分析等综合研究方法，认为紫金山铜金矿床金的赋存状态除金矿石中自然金矿物外，金还赋存于铜矿石中硫砷铜矿、蓝辉铜矿、久辉铜矿和黄铁矿中，硫砷铜矿含金性最好，金含量最高达370μg／g；悦洋银多金属矿床银的赋存状态包括独立银矿物、亚显微银矿物和类质同象银，银的载体矿物有方铅矿、黄铁矿、黄铜矿等；黄铁矿是紫金山铜金矿床和悦洋银多金属矿床中共同存在的矿物，黄铁矿成分标型特征表明两处矿床的形成均与热液有关，与前人的研究结果一致。%The Zijinshan Cu-Au deposit,the Yueyang Ag-polymetallic deposit and the Luoboling porphyry de-posit all belong to the Zijinshan porphyry-epithermal metallogenic system related to continental volcanic activi-ties.It is based on microscope examination,EPMA,FESEM/EDS,content of elements in ores that occurrences of gold and silver have been studied.Gold not only occurs in the form of native gold in gold ores,but also exists in the digenite and enargite,djurleite and pyrite in copper ores in the Zijinshan Cu-Au deposit.Argentite,sub-microscopic silver and silver-bearing galena have been observed in the Yueyang Ag-polymetallic deposit,of which submicroscopic silver exists in the pyrite,galena or between quartz.The silver element is also found in galena,pyrite,chalcopyrite based on the EPMA.The contents of Fe,S,Co,Ni of pyrites indicate that the genesis of the Zijinshan Cu-Au deposit and the Yueyang Ag-polymetallic deposit is in connection with hydrother-mal activity conforming to what has been researched.